# Astro Stacker vs Image Stack

The clearest difference is review sentiment: Image Stack at 100% against Astro Stacker's 0%. Astro Stacker's advantage is monetization model (free vs free with in-app purchases) and update cadence (fortnightly vs monthly). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Astro Stacker sells 3 in-app purchases, starting at $12.99 per month and Image Stack sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Astro Stacker ships an update fortnightly, Image Stack monthly. The most recent releases landed on September 9, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | Astro Stacker | Image Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (4 ratings)](https://appshunter.io/ios/app/astro-stacker-star-images/id6753679598/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 13 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ahmed Al-Mahmud](https://appshunter.io/developer/1844352476) | [Daniel Witt](https://appshunter.io/developer/1438848391) |

## What reviewers say

### Astro Stacker

[App page](https://appshunter.io/ios/app/astro-stacker-star-images/id6753679598)

Transform your smartphone into a powerful astrophotography tool. This app uses advanced algorithms to combine multiple night sky photos, reducing noise and revealing hidden celestial details for professional-quality results.

**Highlights:** Advanced stacking algorithms (Average, Median, Maximum, Minimum), Intelligent and manual image alignment, Real-time processing and progress tracking, On-device processing, no cloud upload, Export high-resolution stacked images, Detailed processing insights and logs

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AstroStacker app | $12.99 | per month |
| AstroStacker app | $99.99 | per year |
| AstroStacker app | $219.00 | one-time |


### Image Stack

[App page](https://appshunter.io/ios/app/image-stack/id6757393848)

This app streamlines image processing by allowing batch conversion, resizing, and renaming. Apply presets, add watermarks, and adjust quality settings with ease. It's designed for efficient handling of multiple images across devices.

**Highlights:** Batch image conversion, Apply multiple presets, Rename files, Resize images, Add overlays/watermarks, Adjust quality and metadata, iCloud preset sync

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $9.99 | one-time |


## Frequently asked questions

### Is Astro Stacker free?

Astro Stacker is free to download, with in-app purchases available.

### Is Image Stack free?

Image Stack is free to download, with in-app purchases available.

### Do Astro Stacker or Image Stack have ads?

Neither Astro Stacker nor Image Stack shows ads.

### Which is updated more often, Astro Stacker or Image Stack?

Astro Stacker ships an update fortnightly, and Image Stack monthly. Most recently, Astro Stacker was updated on September 9, 2026 and Image Stack on September 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*